In addition to the above point many religious organizations offer services like counseling to couples who are struggling as well as things like play groups so parents can manage a date night every once in a while. If you are like me and not religious and have little actual exposure to this sort of thing you may want to spend some time visiting (post Covid) some churches to see what goes on there, its about 50% religion, 50% general life advice and community outreach. It's not surprising to me that a marriage with that support system is less likely to fail than one without.